Naslov
Crossover from one to two dimensions in liquid He-4 in a nanopore

Autori
Vranješ Markić, Leandra ; Dželalija, Krešimir ; Glyde, Henry R.

Izvornik
Physical review. B. (2469-9950) 101 (2020), 10; 104505, 9

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
superfluid transition ; Monte Carlo ; HE-4 ; helium, Luttinger Liquid

Sažetak
Using diffusion and path-integral Monte Carlo methods, we show that liquid 4He confined in a narrow nanopore of liquid radius R=4Å undergoes a crossover from a one-dimensional (1D) to a two-dimensional (2D) fluid as a function of liquid density. At low liquid density, e.g., a linear density ρ0=0.15 Å−1, the liquid energy is at a minimum when the liquid lies in a line at the center of the pore. The pair distribution function g(x), the one-body density matrix n(x), and the superfluid fraction ρS/ρ0 all show 1D character that is well described by Luttinger liquid (LL) predictions. As density is increased, there is a crossover to 2D with the minimum energy configuration moving from a line at the center of the pore to a film near the pore walls. At linear density ρ0>0.40 Å−1, the 4He lies predominantly in a 2D cylindrical film midway between the center and the nanopore walls. The g(x), n(x), and ρS/ρ0 all show 2D character and the film has a low but finite transition temperature. 4He at a bulk liquid density corresponds to ρ0=0.6 Å−1 in the pore which lies in the 2D regime.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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